Euglenophytes

live in water
have flagella for movement
use chloroplasts for photosynthesis, but can turn into heterotrophs if
they are kept in the darkeyespot used for sensing light and dark
pellicle - like a cell wall, helps maintain their shapes

Chrysophytes

Diatoms

Dinoflagellates

Ecology of Unicellular Algae

make up the base of aquatic
food chains

phytoplankton makes up half
of the photosynthesis that occurs on earth (oxygen)